<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP version 5                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available through the world-wide-web at the following url:           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: 分页类                         |
// |          liuzm <liuzm@eswine.com>                                 |
// +----------------------------------------------------------------------+
//

class Page {
    private $each_disNums;          //每页显示的条目数
    private $nums;                  //总条目数
    private $current_page;          //当前被选中的页
    private $sub_pages;             //每次显示的页数
    private $pageNums;              //总页数
    private $page_array = array (); //用来构造分页的数组
    private $subPage_link;          //每个分页的链接
    /**
     * __construct是SubPages的构造函数，用来在创建类的时候自动运行.
     * @$each_disNums   每页显示的条目数
     * @nums     总条目数
     * @current_num     当前被选中的页
     * @sub_pages       每次显示的页数
     * @subPage_link    每个分页的链接
     * @subPage_type    显示分页的类型
     *
     * 当@subPage_type=1的时候为普通分页模式
     * example：   共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
     * 当@subPage_type=2的时候为经典分页样式
     * example：   当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
     */
    function Page($each_disNums, $nums, $current_page, $sub_pages, $subPage_link) {
        $this->each_disNums = intval($each_disNums);
        $this->nums = intval($nums);
        if (!$current_page) {
            $this->current_page = 1;
        } else {
            $this->current_page = intval($current_page);
        }
        $this->sub_pages = intval($sub_pages);
        $this->pageNums = ceil($nums / $each_disNums);
        $this->subPage_link = $subPage_link;
    }
    
    /*
     __destruct析构函数，当类不在使用的时候调用，该函数用来释放资源。
    */
    function __destruct() {
        unset ($each_disNums);
        unset ($nums);
        unset ($current_page);
        unset ($sub_pages);
        unset ($pageNums);
        unset ($page_array);
        unset ($subPage_link);
    }

    /*
     用来给建立分页的数组初始化的函数。
    */
    function initArray() {
        for ($i = 0; $i < $this->sub_pages; $i++) {
            $this->page_array[$i] = $i;
        }
        return $this->page_array;
    }

    /*
     construct_num_Page该函数使用来构造显示的条目
     即使：[1][2][3][4][5][6][7][8][9][10]
    */
    function construct_num_Page() {
        if ($this->pageNums < $this->sub_pages) {
            $current_array = array ();
            for ($i = 0; $i < $this->pageNums; $i++) {
                $current_array[$i] = $i +1;
            }
        } else {
            $current_array = $this->initArray();
            if ($this->current_page <= 3) {
                for ($i = 0; $i < count($current_array); $i++) {
                    $current_array[$i] = $i +1;
                }
            }
            elseif ($this->current_page <= $this->pageNums && $this->current_page > $this->pageNums - $this->sub_pages + 1) {
                for ($i = 0; $i < count($current_array); $i++) {
                    $current_array[$i] = ($this->pageNums) - ($this->sub_pages) + 1 + $i;
                }
            } else {
                for ($i = 0; $i < count($current_array); $i++) {
                    $current_array[$i] = $this->current_page - 2 + $i;
                }
            }
        }

        return $current_array;
    }

    /*
    构造普通模式的分页
    共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
    */
    function subPageCss1() {
        $subPageCss1Str = "";
        $subPageCss1Str .= "共" . $this->nums . "条记录，";
        $subPageCss1Str .= "每页显示" . $this->each_disNums . "条，";
        $subPageCss1Str .= "当前第" . $this->current_page . "/" . $this->pageNums . "页 ";
        if ($this->current_page > 1) {
            $firstPageUrl = $this->subPage_link . "1";
            $prewPageUrl = $this->subPage_link . ($this->current_page - 1);
            $subPageCss1Str .= "[<a href='$firstPageUrl'>首页</a>] ";
            $subPageCss1Str .= "[<a href='$prewPageUrl'>上一页</a>] ";
        } else {
            $subPageCss1Str .= "[首页] ";
            $subPageCss1Str .= "[上一页] ";
        }

        if ($this->current_page < $this->pageNums) {
            $lastPageUrl = $this->subPage_link . $this->pageNums;
            $nextPageUrl = $this->subPage_link . ($this->current_page + 1);
            $subPageCss1Str .= " [<a href='$nextPageUrl'>下一页</a>] ";
            $subPageCss1Str .= "[<a href='$lastPageUrl'>尾页</a>] ";
        } else {
            $subPageCss1Str .= "[下一页] ";
            $subPageCss1Str .= "[尾页] ";
        }

        return $subPageCss1Str;

    }

    /*
    构造经典模式的分页
    当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
    */
    function subPageCss2() {
        $subPageCss2Str = "";
        //$subPageCss2Str .= "当前第" . $this->current_page . "/" . $this->pageNums . "页 ";

        if ($this->current_page > 1) {
            $firstPageUrl = $this->subPage_link . "1";
            $prewPageUrl = $this->subPage_link . ($this->current_page - 1);
            //$subPageCss2Str .= "[<a href='$firstPageUrl'>首页</a>] ";
            $subPageCss2Str .= "<a href='$prewPageUrl'><span class='pagebtn_left'></span></a>";
        } elseif ($this->current_page == 1) {
            $subPageCss2Str .= "<a href='$prewPageUrl'><span class='pagebtn_left'></span></a>";
        } else {
            // $subPageCss2Str .= "[首页] ";
            $subPageCss2Str .= "<a href='$prewPageUrl'><span class='pagebtn_left'></span></a>";
        }

        $a = $this->construct_num_Page();
        for ($i = 0; $i < count($a); $i++) {
            $s = $a[$i];
            if ($s == $this->current_page) {
                $url = $this->subPage_link . $s;
                // $subPageCss2Str .= "<a class='pgactive' href='$url'><span>" . $s . "</span></a>";
                $subPageCss2Str .= "<a class='index_page' href='javascript:void(0);'>" . $s . "</a>";
            } else {
                $url = $this->subPage_link . $s;
                $subPageCss2Str .= "<a href='$url'><span>" . $s . "</span></a>";
            }
        }

        if ($this->current_page < $this->pageNums) {
            $lastPageUrl = $this->subPage_link . $this->pageNums;
            $nextPageUrl = $this->subPage_link . ($this->current_page + 1);
            $subPageCss2Str .= " <a href='$nextPageUrl'><span style='margin:0px;' class='pagebtn_righ'></span></a>";
            // $subPageCss2Str .= "[<a href='$lastPageUrl'>尾页</a>] ";
        } else {
            // $subPageCss2Str .="<a href='#'><span>下一页</span></a>";
            // $subPageCss2Str .= "[尾页] ";
        }
        return $subPageCss2Str;
    }
}

?>